| 2208D2 | Tree Orientation (Hard Version) | | | 2200 | 2.1k |
| 2193G | Paths in a Tree | | | 2100 | 2.4k |
| 2189F | Zhora the Vacuum Cleaner | | | 2800 | 254 |
| 2187G | Many Cartesian Trees | | | 3500 | 110 |
| 2120C | Divine Tree | | | 1400 | 13k |
| 2081D | MST in Modulo Graph | | | 2600 | 1.2k |
| 2071C | Trapmigiano Reggiano | | | 1700 | 9.9k |
| 2068D | Morse Code | | | 3100 | 271 |
| 2063C | Remove Exactly Two | | | 1600 | 15.1k |
| 2041I | Auto Complete | | | 2300 | 688 |
| 2031E | Penchick and Chloe's Trees | | | 2100 | 2.8k |
| 2018C | Tree Pruning | | | 1700 | 10.2k |
| 1976F | Remove Bridges | | | 2800 | 893 |
| 1949F | Dating | | | 2200 | 1.5k |
| 1940C | Burenka and Pether | | | unrated | 44 |
| 1927F | Microcycle | | | 1900 | 5.6k |
| 1919D | 01 Tree | | | 2100 | 4.6k |
| 1918F | Caterpillar on a Tree | | | 2500 | 1.2k |
| 1901E | Compressed Tree | | | 2200 | 2k |
| 1899G | Unusual Entertainment | | | 1900 | 4.1k |
| 1864E | Guess Game | | | 2100 | 3.1k |
| 1857D | Strong Vertices | | | 1300 | 31k |
| 1857G | Counting Graphs | | | 2000 | 5.6k |
| 1851G | Vlad and the Mountains | | | 2000 | 4.2k |
| 1842F | Tenzing and Tree | | | 2500 | 1.9k |
| 1810F | M-tree | | | 2800 | 701 |
| 1764F | Doremy's Experimental Tree | | | 2500 | 1.3k |
| 1746D | Paths on the Tree | | | 1900 | 5.2k |
| 1741D | Masha and a Beautiful Tree | | | 1300 | 18.7k |
| 1707C | DFS Trees | | | 2400 | 2k |
| 1698E | PermutationForces II | | | 2300 | 1.9k |
| 1682E | Unordered Swaps | | | 2700 | 777 |
| 1671E | Preorder | | | 2100 | 3.3k |
| 1665C | Tree Infection | | | 1600 | 10k |
| 1633E | Spanning Tree Queries | | | 2400 | 1.8k |
| 1625D | Binary Spiders | | | 2300 | 2.4k |
| 1615E | Purple Crayon | | | 2400 | 1.8k |
| 1583H | Omkar and Tours | | | 3300 | 505 |
| 1555E | Boring Segments | | | 2100 | 4.7k |
| 1534H | Lost Nodes | | | 3500 | 314 |
| 1519E | Off by One | | | 2700 | 943 |
| 1508E | Tree Calendar | | | 3100 | 453 |
| 1494D | Dogeforces | | | 2300 | 2.9k |
| 1466D | 13th Labour of Heracles | | | 1500 | 15.2k |
| 1463E | Plan of Lectures | | | 2400 | 1.8k |
| 1416C | XOR Inverse | | | 2000 | 5.2k |
| 1408E | Avoid Rainbow Cycles | | | 2400 | 2.2k |
| 1401D | Maximum Distributed Tree | | | 1800 | 10.7k |
| 1399E2 | Weights Division (hard version) | | | 2200 | 2.6k |
| 1394D | Boboniu and Jianghu | | | 2800 | 1.3k |
| 1383A | String Transformation 1 | | | 1700 | 11.4k |
| 1336A | Linova and Kingdom | | | 1600 | 25.5k |
| 1296F | Berland Beauty | | | 2100 | 3.1k |
| 1285E | Delete a Segment | | | 2300 | 2k |
| 1223E | Paint the Tree | | | 2100 | 3k |
| 1214E | Petya and Construction Set | | | 2000 | 2.9k |
| 1213G | Path Queries | | | 1800 | 9.9k |
| 1181D | Irrigation | | | 2200 | 2.9k |
| 1056D | Decorate Apple Tree | | | 1600 | 6.8k |
| 1042F | Leaf Sets | | | 2400 | 1.6k |
| 804D | Expected diameter of a tree | | | 2500 | 1.6k |
| 622E | Ants in Leaves | | | 2200 | 2.5k |
| 613D | Kingdom and its Cities | | | 2800 | 4.3k |
| 540E | Infinite Inversions | | | 2100 | 2.6k |
| 501C | Misha and Forest | | | 1500 | 6.1k |
| 474E | Pillars | | | 2000 | 4.4k |
| 434E | Furukawa Nagisa's Tree | | | 3000 | 452 |
| 196C | Paint Tree | | | 2200 | 1.1k |
| 101D | Castle | | | 2300 | 813 |
| 87D | Beautiful Road | | | 2300 | 1.1k |
| 85C | Petya and Tree | | | 2200 | 642 |
| 76A | Gift | | | 2200 | 2.5k |